EP2504564A1 - Bougie pour laser - Google Patents

Bougie pour laser

Info

Publication number
EP2504564A1
EP2504564A1 EP10759880A EP10759880A EP2504564A1 EP 2504564 A1 EP2504564 A1 EP 2504564A1 EP 10759880 A EP10759880 A EP 10759880A EP 10759880 A EP10759880 A EP 10759880A EP 2504564 A1 EP2504564 A1 EP 2504564A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
laser spark
combustion chamber
flow
prechamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10759880A
Other languages
German (de)
English (en)
Inventor
Werner Herden
Martin Weinrotter
Pascal Woerner
Juergen Raimann
Igor Orlandini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2504564A1 publication Critical patent/EP2504564A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P23/00—Other ignition
    • F02P23/04—Other physical ignition means, e.g. using laser rays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/02—Engines characterised by precombustion chambers the chamber being periodically isolated from its cylinder
    • F02B19/04—Engines characterised by precombustion chambers the chamber being periodically isolated from its cylinder the isolation being effected by a protuberance on piston or cylinder head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/12—Engines characterised by precombustion chambers with positive ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/26—Starting; Ignition
    • F02C7/264—Ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a laser spark plug, in particular for a
  • Combustion chamber window which separates the antechamber from a combustion chamber facing away from the laser spark plug.
  • Such a laser spark plug is already known from DE 10 2006 018 973 A1.
  • a disadvantage of the known laser spark plug is the fact that in one of the antechamber facing surface region of the
  • a laser spark plug of the type mentioned above in that at least one flow-guiding element is provided in the prechamber and arranged so that there is a fluid flow occurring in the prechamber, which towards the combustion chamber window moves, deflects in a radially inner direction.
  • the indication of the radially inner direction refers to a
  • Longitudinal axis or optical axis of the laser spark plug or the antechamber, i. the radially inner direction is substantially perpendicular to the longitudinal axis of the laser spark plug.
  • the provision of the flow-guiding element according to the invention advantageously results in an effective deflection of the combustion chamber window surface facing the prechamber in the case of conventional laser spark plugs
  • Fluid flows such as those that occur during a compression stroke of an internal combustion engine containing the laser spark plug, in which an ignitable air / fuel mixture flows into the prechamber.
  • the deflection of the fluid flow according to the invention is advantageously carried out such that the fluid flow into a radially inner region of the
  • flow-guiding element has a substantially concave flow-guiding surface.
  • Other variants of the invention may also provide flow guiding surfaces, e.g. only partially formed concave, as long as a direct admission of the
  • Combustor window surface or an adjacent volume region is prevented by the fluid flow.
  • Overflow which provides a fluid connection between the antechamber and a Combustion chamber allows. This takes into account the fact that fluid flows in the pre-chamber usually propagate from the ignition point or from the overflow channel.
  • the flow-guiding element is arranged directly in the region of the combustion chamber window, whereby an additional mechanical protection of that volume region in the region of
  • Combustion window results in which the desired Restgaspolster is to train.
  • the flow-guiding element is designed so that it together with one of the antechamber facing surface of the
  • Combustion chamber window surrounds a substantially frusto-conical volume range, the base surface is in the region of the combustion chamber window or is formed by a surface of the combustion chamber window.
  • a corresponding cover surface of the truncated cone-shaped volume region in this case represents a passage opening for the laser radiation to the interior of the prechamber.
  • flow-guiding element surrounds an optical axis of the laser spark plug, in particular concentrically.
  • a particularly stable structure is given according to a further variant of the invention, when the flow-guiding element is formed integrally with a housing of the laser spark plug.
  • Overflow channel is provided, which has a fluid connection between the
  • Prechamber and a combustion chamber allows, and that the overflow is curved. Due to the unique nature of the curvature of the invention
  • Overflow in contrast to conventionally designed as a bore overflow, is advantageously a further degree of freedom in the leadership of a
  • Fluid flow in the interior of the antechamber given, causing the flow-carrying elements according to the invention can be advantageously supported in terms of a desired fluid deflection.
  • a particularly favorable flow guidance in the region of the overflow channels is given by the fact that a longitudinal axis of a first portion of the
  • Overflow channel which opens into an inner region of the prechamber, includes a larger angle with the optical axis of the laser spark plug as a longitudinal axis of a second portion of the overflow channel, which opens into an outer region surrounding the prechamber.
  • the first longitudinal axis of the first section of the overflow channel may well include a right angle with the optical axis of the laser spark plug, while the second longitudinal axis of the second portion of the overflow preferably include an acute angle, in particular an angle ⁇ 20 °, with the optical axis of the laser spark plug can.
  • FIG. 1 shows a first embodiment of a laser spark plug according to the invention in a partial cross section
  • Figure 2 shows a second embodiment of an inventive
  • FIG. 3 shows a third embodiment of a laser spark plug according to the invention.
  • FIG. 1 shows a partial cross section of a first embodiment of the laser spark plug 100 according to the invention.
  • the laser spark plug 100 has an integrated laser device 105 which can generate laser radiation 20 and focus it on the ignition point ZP lying in a prechamber 110 of the laser spark plug 100.
  • the laser spark plug 100 may also be configured to be supplied with laser radiation from a remote source (not shown) that concentrates it to the ignition point. In this case, the local
  • the interior of the prechamber 110 is separated from the combustion chamber remote part 100a of the laser spark plug 100 by a combustion chamber window 140.
  • the laser spark plug 100 or its prechamber 1 10 has over
  • Overflow 120 the fluid communication between the pre-chamber 1 10 and an outer area 200, in which it is in the installed position of
  • Laser spark plug 100 can act in an internal combustion engine, for example, to a combustion chamber of the internal combustion engine.
  • the laser spark plug 100 furthermore has at least one flow-guiding element 130, which in the present case has a substantially rotationally symmetrical design and is arranged in the region of a surface of the combustion chamber window 140 facing the prechamber 110.
  • the flow-guiding element 130 effects the deflection of a fluid flow F directed onto the combustion chamber window 140 into a radially inner region or a radially inner direction relative to the optical axis OA of the laser spark plug 100.
  • the arrow F 'shown by dashed lines in FIG. 1 shows the deflected according to the invention fluid flow.
  • a residual gas cushion 150 can advantageously form in the volume region 11, which advantageously protects the surface of the combustion chamber window 140 from dirt particles and other undesirable elements, such as during combustion due to laser ignition in the prechamber 1 10 arise.
  • the flow-guiding element 130 preferably has a substantially concave flow-guiding surface 130 a, which advantageously corresponds to the Ignition point ZP or an overflow 120 faces, so that an efficient flow deflection is possible in a radially inner region.
  • flow-guiding element 130 need not necessarily be arranged directly adjacent to the combustion chamber window 140, this advantageously results in the formation of a particularly good
  • FIG. 2 shows a further embodiment of the invention
  • flow-guiding element 130 is designed such that, together with the surface of combustion chamber window 140 facing prechamber 110, it surrounds a substantially frusto-conical volume region 11 whose base lies in the region of combustion chamber window 140 or is formed directly through the surface of combustion chamber window 140 is.
  • a cover surface of the frustoconical volume range 1 1 1 still allows - albeit limited - fluid communication of the volume range 1 1 1 with the remaining volume of the prechamber 1 10 and the transmission of the laser radiation 20 to the ignition point ZP.
  • a particularly uniform flow guidance or deflection of the fluid flow F (FIG. 1) from the combustion chamber window 140 can take place in that the flow-guiding element 130 surrounds an optical axis OA of the laser spark plug 100, in particular concentrically.
  • the flow-guiding element 130 may preferably also be integrally formed with the housing 101 of the laser spark plug, whereby a mechanically particularly stable configuration is achieved.
  • FIG. 3 shows a further advantageous embodiment of the laser spark plug 100 according to the invention, in which the lateral transfer passages 120 'are curved.
  • a longitudinal axis L1 of a first section of the laser spark plug 100 in which the lateral transfer passages 120 'are curved.
  • Overflow 120 ' which in a prechamber 1 10 surrounding
  • the angle oc2 between the second longitudinal axis L2 and the optical axis OA is preferably less than about 50 °, more preferably less than about 20 °.
  • the shaping of the curved overflow channels 120 'and of the flow-guiding element 130 is coordinated such that an optimized flow deflection is ensured by the volume region 11 (FIG. 2) to be protected, while at the same time ignition torches (not shown) are in a particularly favorable orientation out of the Pre-chamber 1 10 can escape into the combustion chamber 200.
  • the ignition point ZP is preferably selected so that it is outside the volume range to be protected 1 1 1, in particular in a right in Figure 1 room half of the pre-chamber 1 10th

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

L'invention concerne une bougie pour laser (100), en particulier pour un moteur à combustion interne d'un véhicule automobile ou un grand moteur à gaz, comprenant une préchambre (110) pour le logement d'un fluide inflammable et une fenêtre d'espace de combustion (140), qui sépare la préchambre (110) d'une partie (100a), opposée à l'espace de combustion, de la bougie pour laser (100). Selon l'invention, il est prévu dans la préchambre (110) au moins un élément (130) guidant de l'écoulement et qui est disposé de telle sorte qu'il dévie un écoulement de fluide (F) apparaissant dans la préchambre (110), qui se déplace vers la fenêtre d'espace de combustion (140), dans une direction radialement intérieure.
EP10759880A 2009-11-23 2010-09-27 Bougie pour laser Withdrawn EP2504564A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009047021A DE102009047021A1 (de) 2009-11-23 2009-11-23 Laserzündkerze
PCT/EP2010/064228 WO2011060987A1 (fr) 2009-11-23 2010-09-27 Bougie pour laser

Publications (1)

Publication Number Publication Date
EP2504564A1 true EP2504564A1 (fr) 2012-10-03

Family

ID=42941843

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10759880A Withdrawn EP2504564A1 (fr) 2009-11-23 2010-09-27 Bougie pour laser

Country Status (5)

Country Link
US (1) US8844491B2 (fr)
EP (1) EP2504564A1 (fr)
JP (1) JP2013511659A (fr)
DE (1) DE102009047021A1 (fr)
WO (1) WO2011060987A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2577042A1 (fr) * 2010-05-27 2013-04-10 Robert Bosch GmbH Allumage induit par laser pour un moteur a combustion interne

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DE102010027943A1 (de) * 2010-04-20 2011-10-20 Robert Bosch Gmbh Verfahren zum Betreiben einer Laserzündkerze für eine Brennkraftmaschine
DE102010029347A1 (de) 2010-05-27 2011-12-01 Robert Bosch Gmbh Laserinduzierte Fremdzündung für eine Brennkraftmaschine
DE102011083143A1 (de) * 2011-09-21 2013-03-21 Robert Bosch Gmbh Vorkammermodul für eine Laserzündkerze
DE102013226119A1 (de) * 2013-02-11 2014-08-14 Robert Bosch Gmbh Laserzündsystem
JP6478509B2 (ja) 2014-07-31 2019-03-06 株式会社Ｓｏｋｅｎ レーザ点火装置
WO2016028760A1 (fr) 2014-08-18 2016-02-25 Woodward, Inc. Allumeur de chalumeau
JP6261481B2 (ja) * 2014-09-19 2018-01-17 日本特殊陶業株式会社 点火プラグ
US11421601B2 (en) 2019-03-28 2022-08-23 Woodward, Inc. Second stage combustion for igniter
JP7332252B2 (ja) * 2020-02-10 2023-08-23 東芝エネルギーシステムズ株式会社 ガスタービン燃焼器

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* Cited by examiner, † Cited by third party
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EP2577042A1 (fr) * 2010-05-27 2013-04-10 Robert Bosch GmbH Allumage induit par laser pour un moteur a combustion interne

Also Published As

Publication number Publication date
DE102009047021A1 (de) 2011-05-26
WO2011060987A1 (fr) 2011-05-26
US8844491B2 (en) 2014-09-30
JP2013511659A (ja) 2013-04-04
US20120279469A1 (en) 2012-11-08

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